Under the bill, a person who modifies an exhaust system to “produce noise in excess of OEM stock decibel levels” would be forced to pay a fine of $10,000 for each violation, SEMA said.

According to the Diamond Bar-based trade group, under Michigan law a motor-vehicle repair facility means “a place of business which engages in the business of performing or employing persons who perform maintenance, diagnosis, vehicle body work or repair service on a motor vehicle for compensation,”

More information about the legislation is on the SEMA Action Network website.